摘要：CO2 storage in shale reservoirs has become increasingly important in the context of the problems posed by global warming. However, a clear understanding of the impact of pore heterogeneity of shale with different lithofacies on CO2 storage capacity is lacking. In this study, we examined the Paleogene shale in the Nanpu Sag of the Bohai Bay Basin as an example of a reservoir for CO2 storage. First, we used experimental methods such as X-ray diffraction (XRD) analysis, Total organic carbon (TOC) content determination, Rock-Eval pyrolysis analysis, vitrinite reflectance analysis, CO2 adsorption, N2 adsorption, and High-pressure mercury intrusion (HPMI) to study the effect of pore heterogeneity of shale with different lithofacies on CO2 storage. Subsequently, Molecular dynamics (MD) simulations were performed to simulate the isothermal adsorption of CH4 and CO2, verifying the rationality of CO2 storage with enhanced gas recovery. Results reveal that the research area mainly contains clayey shale, mixed shale, and felsic shale. Micropore heterogeneity decreases in the order of mixed shale ＞ felsic shale ＞ clayey shale, micropore connectivity in the order of clayey shale ＞ felsic shale ＞ mixed shale, mesopore heterogeneity in the order of mixed shale ＞ felsic shale ＞ clayey shale, and mesopore connectivity in the order of clayey shale ＞ felsic shale ＞ mixed shale. The micropores in the shale in this area have higher heterogeneity and considerably lower connectivity than the mesopores. An increase in clay minerals, carbonate minerals, and pore heterogeneity is beneficial for CO2 storage. In contrast, increases in TOC, quartz, potassium feldspar, plagioclase, and pore connectivity are not conducive to CO2 storage. Overall, pore connectivity exerts the greatest impact on CO2 storage. Compared with micropores, the heterogeneity of mesopores exerts a greater impact on CO2 storage. For low-permeability shale, organic-medium mixed shale has low connectivity and strong heterogeneity, making it more suitable for CO2 storage. The results of isothermal adsorption suggest a stronger affinity of the shale for CO2 than for CH4. Thus, the injected CO2 can displace CH4 adsorbed in the pores, thereby enabling effective CO2 storage. This study holds guiding significance for implementing subsequent CO2 storage projects. ? 2025 Elsevier B.V.

ISSN号：0013-7952

卷、期、页：卷353,

发表日期：2025-06-25

影响因子：0.000000

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Engineering Geology

通讯作者：施砍园,张思佳,惠沙沙,王雷,金玉洁,李才俊,王玉莹,李冰瑶

第一作者：陈君青,庞雄奇,陈迪,CHEN ZHANGXING

论文类型：期刊论文

论文概要：施砍园,张思佳,陈君青,庞雄奇,惠沙沙,陈迪,王雷,金玉洁,李才俊,王玉莹,李冰瑶,CHEN ZHANGXING，Influence of pore heterogeneity of shale with different lithofacies on CO2 storage: Experiments and molecular dynamics simulation，Engineering Geology，2025，卷353,

论文题目：Influence of pore heterogeneity of shale with different lithofacies on CO2 storage: Experiments and molecular dynamics simulation